Protogate Freeway 3600 Guia do Utilizador descarregar pdf (Página 52)

52 DC 900-1340I

BSC Programmer’s Guide

3.3 Overview of DLI Functions for BSC 3270

This section summarizes the DLI functions used in writing a client application. An

overview of using the DLI functions is:

• Start up communications (dlInit, dlOpen, dlBufAlloc)

• Send requests and data using dlWrite

• Receive responses using dlRead

• For blocking I/O, use dlSyncSelect to query read availability status for multiple

sessions

• For non-blocking I/O, handle I/O completions at the software interrupt level in

the completion handler established by the

dlInit or dlOpen function, or by periodic

use of

dlPoll to query the I/O completion status

• Monitor errors using dlpErrString

• If necessary, reset and download the protocol software to the ICP using dlControl

• Shut down communications (dlBufFree, dlClose, dlTerm)

Ta ble 3 –3 summarizes the DLI function syntax and parameters, listed in the most likely

calling order. Refer to the Freeway Data Link Interface Reference Guide for details.

Caution

When using non-blocking I/O, there must always be at least one

dlRead request queued to avoid loss of data or responses from the

ICP.

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